Composition of matter for developing and fixing photographic exposures.



TES P FREDERICK W. HOCHSTETTER, OF NEW YORK, N. Y., ASSIGNOR TO K; P. PATENTS PROCESSES COMPANY, INC., A CORPORATIONOF NEW YORK.

COMPOSITION OF MATTER FOR DEVELOPING AND FIXING PHOTOGRABH IC E XPO SURESD Ito Drawing.

To all whom it may concern Be it known that I, Fnnnsurox l s'rn'rrnn, a subject of the Emperor of Germany, and a resident of New York, county and State" of New, York, have invented a certain new and useful Composition of Matter for Developing and Fixing Photographic Exposures, o;t which the following is a full, clear, and exact specification.

This invention relates to a class of compositions adapted to be used for producing photographic picture's.

My invention has for its objectprimarily to provide a composition of matter designed to be usedfo'r permitting the negatives of picture. films to be produced consecutively with the exposures of the film when'photographing living objects or scenery, and

Which is especially adapted to enable a series 20 of photographs of moving objects to be quickly made, the composition beingused [preferably by saturating a strip of absorbent material which is arranged in the camera or similar photographic apparatus utilized for making the exposures of the sensitized film, whereby the exposures will be developed into negatives for permitting a'number of pictures to be made therefrom, or if desired the exposures may be developed into positives so that the pictures may be exhibited without requiring the exposures to be treated by the customary processes which' ordinarily necessitate the employment of various appliances and chemicals, thereby permittinga person particularly when unskilled in the art of photography to readily produce photographic pictures.

My coin osition of matter consists of the following ingredients, combined'in the proportions stated, viz:

Solution N 1: Developing agent, such as hydroquinone,'metol, adurol, amidol, glycin,

edinol, kachin, or other similar agents, 150 grains; sodium sulfite, 75 grains; hot water, by measure, 10 ounces; glycenmby measum, 15 ounces.

Solution No.2: Alkali carbonate such as potassium carbonate, 75 grains; water, by measure, 10 ounces; glycerin, by measure, 15 ounces.

Solution No. 3: Sodium hyposulfite, 240 grains; water, by measure, 10 ounces.

To the ten ounces of hot water contained in a suitable receptacle is added the hydro- Specification of Letters Patent.

W. Hoonmixture.

quinone, and the mixture is agitated until the hydroquinone is dissolved. The sodium sulfite is then dissolved in this solution, and the glycerin is afterward incorporated therein. This mixture serves as stock solution number one, and may be retained in a tightly closed bottle, or the like so as to be used as occasion requlres.

Solution number two is made by dissolv- Patented'Dec. 5, 1916..

Application filed October 7,3913. Serial No. 793,891.

ing the potassium'carbonate or other suitable alkali carbonate in ten ounces of cold water contained preferably in a suitable hotthe, and fifteen ounces (by measure) of glycerin is then added thereto. After these ingredients are thoroughly mixed the bottle is closed so as to be air-tight for also serving as stock solution. 1

Solution number three is made by placing ten ounces of water in a bottle or other suitable receptacle, and then dissolving by agi-' tation the sodium hyposulfite in the water.

Still another stock solution is foi'med by this therefrom, I make a mixture of a number of the above solutions as follows :'stock solution No. 1, by measure, 10 ounces; stock solution No. 2, by measure, 10 ounces; stock solution No. 3, by measure, 6 ounces; glycerin, by measure, 13 ounces; citric acid, 5 grains. Y

The solutions No. 1, No. 2, No. 3, and the glycerin are thoroughly mixed in a suitable receptacle, and in this solution is dissolved the citric acid.- A strip of felt or other similar absorbent material is saturated with the mixture. The saturated strip is then" wound upon a spool or the like which in turn is arranged in a camera, or like photographic apparatus in a manner so as to be disposed in contact with the sensitized film consecutively with the exposures thereof, as shown in my pending application for a patent for camera, serially numbered 778,944, filed July 14, 1913. The exposures of they film will thereby receive the direct action of the developing agents for produc-- ing negatives of the pictures'without requiring the exposures to be treated by the customary processes wherein the employposition a person whether skilled or unskilled in the art of photography may conveniently produce this class of negatives.

While in the foregoing description, I have set forth the preferred-formula of my composition, I do not Wish to be understood as limitingmyself thereto, as I am aware that any developing agent may be employed other than the agents herein mentioned, and that the proportions of the ingredients mentloned may be varled, or in instances one or more of the ingredients may be dispensed with Without departing from the principle or sacrificing any of the advantages of this invention, therefore I reserve to myself the agent, sodium sulfite, an alkali carbonate,

sodium hyposulfite, glycerin and citric acid. This specification signed and witnessed this sixth day of October, A. D. 1913.

FREDERICK W. HOCHSTETTER. Witnesses:

. RoB'r. B. ABiBo'rr, M. DERMODY. 

